Elmer a



(No Model.)

E. A. SPE'RRY.

DYNAMO.v

No. 405,441. 7 Patented June 18,1889.

UNITED STATES PATENT OFFICE.

ELMER A. SPERRY, CHICAGO, ILLINOIS, ASSIGNOR TO THE SPERRY ELECTRICCOMPANY, OF SAME PLACE.

DYNAMO.

SPECIFICATION forming part Of Letters Patent No. 405,441, dated June 18,1889.

Application filed February 11, I889. $eria1No. 299,477. (No model.)

To all whom it may concern; to the spider and the armature to it, issuch Be it known that I, ELMER A. SPERRY, a that the strains resultingfrom the support of citizen of the United States, and a resident sucharmature on the bolt and from the sup- 50 of Chicago, in the county ofCook and State port of the bolt and armature on the spider 5 ofIllinois, have invented certain new and are independent of each other,and the strain useful Improvements in Dynamos, of which on the armatureis wholly within itself. From the following is a specification. thisresultsa far greatersecurity and accuracy My invention relates toimprovements in in fixing and retaining the armature in posi- 5 5.dynamo-electric machines, and has for its obtion with reference to thefield-magnets. IO ject to provide means for conveniently and I claim asnew and desire to secure by Letsecurely supporting the armature. tersPatent- My improvement is illustrated in the are 1. In a dynamo-electricmachine, the comcompanying drawings, wherein bination of a rotatingspider with a series of 60 Fi 'ure 1 is a cross-section throu h onebolts ro'ecting therefrom and secured I 5 field-magnet and one portionof the armature, thereto and an armature secured on such and Fig. 2 is afront view of the field-magnets bolts independently of the spider.

and armature with commutator removed. 2. In a dynamo-electric machine,the com- Like parts are indicated by the same letter bination of arotating spider wit-h a series 65 in all the figures. of boltsprojecting therefrom and secured A is the armature-shaft, which carriesthe thereto by a collar and nut on opposite sides spider B, havingsundry arms C radiating of such spider-arms, with an armature securedtherefrom. to such bolts independently of the spider.

D D are the field-magnets, composed each In a dynamo-electric machine,the com- 70 of a single piece having the channel E to rebination of arotating spider with a series of ceive the cylindrical armature F andthe end bolts secured thereto and projecting there- G to receive thewinding H. The armature from, and an armature secured on such bolts iswound with transverse coils divided into between a flange and a nut oneach of said sections, from each of which passes a conductbolts. 7 5 orJ to strip K, which in turn is connected 4. In a dynamo-electricmachine, the comwith the commutator-bar L, which is sup bination of arotating spider with a series of ported on the shaft by means of thecollar M bolts projecting from the arms thereof, each and the insulationN. On each arm of the secured thereto by a flange and nut on oppospideris supported a bolt 0 by means of the site sides of such spider-arm,with an arma- 8o washer P and nut R on opposite sides of such turesecured on such bolts, between a flange 3 5 arm. and a nut on each ofthem.

S is the armaturecore on which the wire is 5. In a dynamo-electricmachine, the comwound. On the bolt 0 is the flange T, and bination of arotating spider with an annular on its extremity is the nut U. Aboutthis. armature and bolts, which project from and 85 bolt is suitableinsulation. 4 are secured to the spider, and to which in 0 The use andoperation of my invention are turn is secured the armature independentlyas follows: The shaft being rotated, the arof the spider. mature isrotated in the channels of the field- Dated this 9th day of February,1889. magnets, and if such magnets are energized T currents will bedeveloped on the armature ELMER SPERRX and given off on the commutatorin the usual WVitnesses:

manner. The arrangement of collar, flange, CELESTE P. CHAPMAN, and nutson each bolt, whereby it is secured FRANCIS M. IRELAND.

